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SHE Chang,CAI Tao,WEI Peng,DUAN Shanxu.Research on Decentralized Logic Equalization System for Power Battery and Its Equalization Strategy[J].JOURNAL OF POWER SUPPLY,2019,17(2):153-162
Research on Decentralized Logic Equalization System for Power Battery and Its Equalization Strategy
Received:April 02, 2018  Revised:August 15, 2018
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DOI:10.13234/j.issn.2095-2805.2019.2.153
Keywords:battery equalization  distributed logic control  droop control  bi-directional dual half-bridge(DHB) converter
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SHE Chang State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan , China
CAI Tao State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan , China caitao@hust.edu.cn
WEI Peng State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan , China
DUAN Shanxu State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan , China
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Abstract:
      A decentralized logic equalization system suitable for high-voltage power battery packs is studied in this paper, and its structure and control strategy are given. In this system, the entire vehicle battery pack is divided into multiple battery modules for modular decentralized management. The equalization converter combines the voltage information of battery modules, constructs a variable parameter droop controller, and adjusts the input and output power of battery modules, thus realizing a real-time equalization. At the same time, the equalization converter can also replace the in-vehicle auxiliary lead-acid battery to supply power to the on-board low-voltage equipment, thereby reducing the volumes and costs of electrical units in the vehicle. The stability under the equalization control strategy is analyzed, and the model and design of the equalization converter, i.e., a bi-directional dual half-bridge(DHB) converter, are performed. Experimental results verified the feasibility of the equalization system and the equalization strategy.
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